Effect of pouring temperature on thixotropic microstructure formation of AZ91

Ning, Zhiliang and Wu, Peilian and Wang, Hao and Cao, Fuyang and Sun, Jianfei (2007) Effect of pouring temperature on thixotropic microstructure formation of AZ91. Rare Metals, 26 (S1). pp. 180-184. ISSN 1001-0521

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Abstract

The effect of pouring temperature on thixotropic microstructure of AZ91 was investigated. The results show that the pouring temperature has a pronounced effect both on microstructural morphology and grain size. By decreasing the pouring temperature, the morphology of grains changes from coarse dendritic to fine dendritic structure. The fine dendritic structure that was obtained at low pouring temperature developed into a globular structure with a grain size of 60 pun, if the AZ91 was partially remelted and held isothermally at the semisolid state (575 degrees C). On the other hand, if the alloy was poured at a high superheat, the particles were irregular and interconnected with a grain size of 180 mu m even after 20 ruin of isothermal holding


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Depositing User: Dr Hao Wang
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 02 Apr 2008 05:52
Last Modified: 18 Sep 2012 06:15
Uncontrolled Keywords: semisolid state; alloys; behaviour; pouring temperature; microstructural evolution
Fields of Research (FOR2008): 09 Engineering > 0910 Manufacturing Engineering > 091006 Manufacturing Processes and Technologies (excl. Textiles)
09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/4040

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